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| Chapter 3: Exponents and
Polynomials
Numbers in the Real World |
Sale Prices
You've probably been to a clearance sale at a clothing store at some point in your life. When the store advertises a percent discount, how
do you compute how much you'll have to pay?
Let's look at an example. A particular store is advertising that all dresses
are 20% off their original price. If you bought a dress
on sale that originally cost $100, your sales receipt would look something like
this.
| House of Fashions
where you dress for success for less |
|
| item | price |
| original price of dress | $100.00 |
| less discount of 20% | -$20.00 |
| sale price of dress | $80.00 |
| tax of 7% | $5.60 |
| TOTAL | $85.60 |
If the sale price is 20% off of the original price, what percent of
the original price are you paying?
How could you use this result to find the sale price of the dress?
Use this result to find the sale price of dresses that cost $80.
Find the sale price of dresses that cost $65.
Find the sale price of dresses that cost $22.
If a dress costs $72.49, use estimation to find the approximate sale
price.
Compute the actual sale price. How much difference is there between the actual and your approximation?
Is the difference significant with respect to the actual price?